Have the vehicle scanned for error codes at autozone, its free. Post codes for more help....These engines have issues with the COPs (ignition coils-over-plugs) failing prior to 80k miles. When they fail typical problems are: Sputtering under load/acceleration, rough idle, random misfires, random stalling, light or heavy jerking under load (usually at 15-35mph and 45-65mph)..hopefully this helps!!
Have scanned for trouble codes - can be anything from a spark plug to vacuum leak
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If you get it scanned at AutoZone no need to post the codes here. AutoZone will look up the codes and tell you the three most probable causes and print them for you, that is Free as well. Usually they can pretty well pinpoint your problem.
Your TPS(Throttle Position Sensor) & or IACV(Idle Air Control Valve) can both mess with the idling ruff and sputtering going down the road. I'll be surprised it your codes doesn't point to one or both of them.
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